HVDC Transmission with STATCOM

Most of the HVDC power converters with thyristor valves are assembled in a converter Bridge of Six pulse configuration. Converter transformers with one DC side winding as an ungrounded star connection and the other a delta configuration. Comparative studies of the two systems of HVDC CIGRE model without STATCOM and with STATCOM were performed. In these case, the consideration was the converter transformer saturation, which results in voltage and current distortion at the inverter end and Rectifier End. Results with certain fault cases-with either 1-phase, 3-phase and Dc fault at the inverter end and rectifier end are presented. (i.e., taken from CIGRE model) Power Quality analyzed both at rectifier and inverter end after the fault and the types of fault taken in to considerations are: 1) L-G fault, 2) L-L-G fault, 3) DC fault. This should be compared where the corresponding case with the STATCOM in place is depicted. In this project work, a HVDC transmission line from CIGRE model sending end and receiving end power having 100MVA. The DC line is approximately 100 km long and is connected to the 100MVA system through two converter transformers, one of them with wye (grounded)/delta configuration, and the other with delta / wye (grounded) configuration at each end, from the simulation results, it has been shown that the voltage profile analysis can be done by using PSCAD/EMTDC software.